what should I do

So I went to the doc on 1 April because I was feeling really sick and she said that I have an vaginal infection. They give me a lot of drugs to treat the infection but I didn't take any yet. So my period is 3days late and I took a pregnancy test yesterday and it came out negative but still I don't wanna take the drugs because am afraid that I might be pregnant and harm the fetus I'm so confused what should I do